9SmartCruiseVehicle Cut In and OutIf another vehicle in an adjacent lane cuts in front and continues to the oppo-site adjacent lane, SmartCruise is programmed to maintain the host vehiclespeed. If the speed of the target vehicle is faster than that of the host vehicle,the host will continue to maintain its speed. However, if the speed of the targetvehicle is less than the host’s speed, the engine ECM will issue a command toreduce fuel and may also engage the engine retarder. Once the target vehiclemoves out of the host’s lane, the host will restore the cruise control speed orresume the following interval if another target vehicle is in the lane. Again, thedriver may need to apply the brakes to maintain a safe distance. The drivermay depress the brakes or accelerator pedal at any time to override Smart-Cruise.Cut in and StayIf a target vehicle in an adjacent lane cuts in front of the host vehicle andremains there, the system will respond by slowing the host to restore the setfollowing interval to the target vehicle. The engine ECM will reduce fuel and, insome cases, SmartCruise may also engage the engine retarder to accomplishthis. Again, the driver may need to apply the brake to maintain a safe distance.Vehicle Ahead Changes LaneWhen maintaining a following interval to a target vehicle in front, and thatvehicle moves into an adjacent lane, the system will respond as follows. Ifthere is no other vehicle ahead (or within the range of the system), the hostwill accelerate to the set cruise speed. If there is another vehicle ahead, thehost vehicle will restore the following interval to that vehicle. Again, the drivermay need to apply the brake to maintain a safe distance.SmartCruise and Eaton Automated TransmissionsUnder any situation that causes the system to slow the vehicle, and the enginerpm reaches a preset minimum, the transmission will automatically down-shift. Similarly, any situation that causes the vehicle to accelerate and a presetmaximum engine rpm is reached, the transmission will upshift.Note: This feature is not currently available with Allison Transmissions.